Todd — Studies in the Tyrannidce. 203 



it to be the female of the species with the tail partly rufous, and his descrip- 

 tion of the nest and eggs is certainly all wrong. Von Pelzeln was satisfied 

 that these color-differences were not sexual, but thought they were due to 

 age, as also did Reinhardt. Meanwhile Cabanis and Heine had described 

 a bird from Brazil under the name Myiarchus swainsoni, comparing it with 

 M. ferox. No definite locality is mentioned, but in view of the fact that 

 the diagnosis fits the bird of southern Brazil as compared with typical 

 ferox we may accept the name for the form under consideration, instead of 

 cantans of von Pelzeln, described in 1869. We would suggest Rio Janeiro 

 as the type-locality. Specimens from Paraguay and Argentina are pre- 

 cisely matched by those from Rio Janeiro and Sao Paulo, so that we can 

 find no ground for distinguishing them, and even if they were separable the 

 name ferocior of Cabanis would not be available, since it pertains to a bird 

 of the M. pelzelni group. As in other forms of this generic group, old skins 

 are faded as compared with freshly collected material, and this fact must 

 be borne in mind. New specimens in fresh plumage from Bahia are refer- 

 able to typical ferox, while similar skins from Rio Janeiro are obviously 

 swainsoni, but no material from the intermediate region has been examined 

 in this connection. 



Specimens examined. — Brazil: Rio Janeiro, 2; La Raiz (foot of Organ 

 Mts.), 2; S. Carlos do Pinhal, Sao Paulo, 1; Victoria, Sao Paulo, 1; Franca, 

 Sao Paulo, 1; Itapura, Sao Paulo, 1; Chapada, Matto Grosso, 17; San 

 Lorenzo River, Matto Grosso, 1 ; Agua Blanca de Corumbd, Matto Grosso, 

 1; Descalvados, Matto Grosso, 2; unspecified, 2. Argentina: Puerto 

 Segundo, Misiones, 6; Ocampo, Chaco de Santa Fe, 1; Santa Ana, Misiones, 

 3; Bonpland, Misiones, 2; Aguirre, 2; Las Palmas, Chaco, 2; Resistencia, 

 Chaco, 1; Tapia, Tucumdn, 1. Paraguay: Escobar, 1; Puerto Pinasco, 1; 

 Sapucay, 2; Puerto Bertoni, 1. Bolivia: Santa Cruz de la Sierra, 1; 

 Buenavista 2; Palmarito, 1; Rio Quiser, 1; Rio Surutu, 1; Yungas, 1; 

 Mapiri, 1; Tres Arroyas, Espirito Santo, 1; Todos Santos, Cochabamba, 4. 

 Total, 67. 



Myiarchus ferox venezuelensis Lawrence. 

 Myiarchus ferox (not Muscicapa ferox Gmelin) Cabanis, in Schomburgk, 

 Reisen in Britisch-Guiana, III, 1848, 700 (British Guiana). — Cabanis 

 and Heine, Mus. Heineanum, II, 1859, 73, excl. syn. (Venezuela). — 

 Sclater and Salvin, Proc. Zool. Soc. London, 1868, 168 (Venezuela). — 

 ScLATER, Cat. Am. Birds, 1862, 233, part (Trinidad). — Sclater, Cat. 

 Birds Brit. Mus., XIV, 1888, 253, part (San Esteban, Venezuela, and 

 Trinidad). — Chubb, Birds British Guiana, II, 1921, 228 (British Guiana 

 references and localities; descr.). 

 Myiarchus venezuelensis Lawrence, Proc. Acad. Nat. Sci. Philadelphia, 

 1865, 38 (Venezuela; orig. descr.; type in coll. Am. Mus. Nat. Hist.). — 

 Sclater and Salvin, Proc. Zool. Soc. London, 1868, 628 (San Esteban, 

 Venezuela), (?) 632 (Tobago; crit.). — Finsch, Proc. Zool. Soc. London, 

 1870, 554 (Trinidad, ex Sclater) .—Allen, Bull. Am. Mus. Nat. Hist., IV, 

 1892, 347 (crit. on type). — Brabourne and Chubb, Birds S. Am., I, 

 1912, 302 (ref. orig. descr.; range). 



